Sony vs Sigma blue and gray resolution measurements

Started 7 months ago | Discussions thread
xpatUSA
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Re: Sony vs Sigma blue and gray resolution measurements
In reply to docmaas, 7 months ago

docmaas wrote:

First the blue:

Sony A7r response to the blue chart. f5.6 18mm sigma 18-35 f1,8 iso 100

Sigma SD1 response to the blue chart. f5.6 18mm sigma 18-35 f1,8 iso 100

The sony response to the blue is surprisingly fat. It makes me wonder if the IDC is boosting the blue.

Thanks for taking the time to publish the results of what is obviously a lot of work. In the Sony above the rise of amplitude with frequency does mean that IDC is messing with the image data. That would put me off if I were a Sony candidate. The Sigma response is much 'better' from my POV.

Now the crops of the charts:

Sony

Compared to slant-edge testing, the results gained from this method do seem to be easier to assess and more visually representative.

For camera performance analysis, I try to exclude as much converter processing as possible and have lately been using output from RawDigger and such. It's surprising how soft and noisy 'raw' images can be! Less surprising is how much 'pre-processing' goes into crap like Adobe Camera Raw which is guaranteed to destroy any X3F fed into it 

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Cheers,
Ted

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